Resolution of Vista Unidentified Network or Limited Connectivity
The Vista Unidentified Network or Limited Connectivity could be hardware, TCP/IP configuration or security issues. The following are some resolutions.
1. If this is multihomed computer, computer with two NICs or ICS enabled computers, make sure you have correct TCP/IP, especially default gateway settings. Also refer to this case:
2. If it works before but now, you may re-set router or modem.
3. If other Vista computers work and only one Vista has this issue, upgrade the NIC driver or replace it with different NIC. This post may help too.
4. If XP works but Vista, check if there is any new firmware for the router or new driver for the NIC. Please refer to this link:
Vista Wireless Connection Lost ...